Punching device



R. L. HUBER PUNCHING DEVICE Aug. 2, 1966 4 Sheets-Sheet l Filed Jan. 5, 1964 H is AT TQRN EYS A g- 2, 1966 R. L. HUBER 3,263,914

PUNGHING DEVI CE Filed Jan. 5, 1964 4 Sheets-Sheet Hi8 AT TORN EYS R. L. HUBER PUNCHING DEVICE Aug. 2, 1966 4 Sheets-Sheet 5 Filed Jan. 5, 1964 m u 5 m POWER SOU RCE lNVENTOR L. HUBER T' POWER SOURCE H is AT TORNEYS R. L. HUBER PUNCHING DEVICE Aug. 2, 1966 4 Sheets-Sheet 4 Filed Jan.

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R e. S R L w m N 1 N EU J J R V 1 0 Nb 4 W Y A mm 5 t4 5 United States Patent 3,263,914 PUNCHING DEVICE Roy L. Huber, Plymouth, Mich, assignor to Electronic Assistance Corporation, Red Bank, N.J., a corporation of New York Filed Jan. 3, 1964, Ser. No. 335,586 4 Claims. (Cl. 23430) This invention relates to punching devices, and more particularly, to a novel and improved punching device for forming perforations in predetermined positions on a card, tape or the like.

In addition to its use in commercial data processing applications, the punched card is finding Wider use as an information input and record medium in direct dealings with the public. Retail sales operations, for example, are in the process of development wherein the purchaser selects his desired purchase from a display of goods and identifies his selection by suitable punches on a card. The card is then used to actuate automated facilities to withdraw the selected item from stock and deliver it to a pick-up desk, and also directly for accounting purposes.

Another potentially widespread consumer use of the punched card is in parirnutuel betting systems, both on and ofi track. Here, the individual bettor purchases a card representing a given denomination of bet and punches in it, at unattended stations in the betting area, additional information representing the bet he desires to place. The bettor is provided with a betting ticket and information representative of the bet is fed to the parimutuel odds computer.

Other similar applications of the punched card, in which the punching mechanism is to be operated by untrained persons, are or will be forthcoming. For such uses, a suitable punching device should "be relatively foolproof in operation, as well as rapid.

Conventional punching mechanisms for perforating cards and the like, such as for data processing purposes, employ a single row of punch pins which are selectively actuated to punch one or more holes in parallel columns on the card. Generally, each punched column on the card represents only a single item of information, and many successive punching operations must be performed to provide a card having the many items of information usually being recorded thereon. Where, as is often the case, the purpose to which the cards are to be put requires the entry of similar data on each card, for example, dates or identifying numbers, the repetitive reselection of appropriate punches becomes extremely burdensome and time consuming, and in addition, increases the likelihood of operator error. Moreover, a certain degree of operator skill is required to select the desired punches.

Accordingly, it is the object of the present invention to provide a punching device, particularly suited for ready manipulation by the untrained public, which is simple in construction and rapid and reliable in operation.

There is provided, in accordance with the invention, a punching device in which all information to be recorded on the card or tape is punched simultaneously. In the device the information is preset by rendering selected punch pins operable to perforate the card or tape. All of the information is then punched into the card or tape in a single gang punching operation.

The device includes a punch pin carrier, a plurality of punch pins mounted for axial movement in the carrier, a die member having openings in matching relationship to the punch pins located adjacent the carrier and a chamber for receiving a card or tape located between the carrier and the die. The punch pins are arranged to have limited movement toward the die so that when the carrier is moved away from the die, the pins do not project into the chamber. Means actuated by control devices are provided for blocking the axial movement of the pins away from the die member so that they are moved with the carrier to perforate the card or tape.

The invention further includes novel means for actuating the carrier and control means including means to initiate its operation and means responsive to the positioning of a card or tape in a predetermined position in the chamber and to the position of the carrier to sustain its operation through one cycle. More particularly, the control means preferably includes a push-button type switch actuatable by the operator and a second switch in series therewith located adjacent the chamber for contact and closing by a portion of the card when the card is properly positioned in the chamber. The carrier is provided with a cancelling punch member which removes the portion of the card contacting the switch and allows it to open. The actuating means is thereafter controlled in accordance with the position of the carrier. After a punching cycle, the second switch cannot be actuated by a previously punched card, and therefore, only an uncancelled card can be punched in the device.

Another feature of the punching device is the provision of two or more rows of punch pins in which the pins in each row are of different length, thereby permitting each successive row to be blocked by interposed bars entering the carrying member generally laterally and arranged in tiers lying in planes passing through the axes of the pins at an angle to the rows of pins.

In use, the punching device is preset by rendering operative selected punch pins so that a predetermined pattern representing the information to be recorded will be punched. A card, tape or the like is positioned in the chamber to actuate the second switch. The push-button is then pressed to start the punching operation. All perforations are made in a single cycle of the pin carrier, during which the cancelling punch also removes the portion of the card or tape operating the second switch so that the card cannot be reused. When the pin carrier is withdrawn to a predetermined position, the actuating means is stopped and the card withdrawn. The device is now ready for setting up the next punch pin pattern.

Inasmuch as a complete set of information is punched into the card in a single operation rather than by successive punches and movements of the card or tape, the device is well adapted for operation by persons having no special training, such as would be encountered in the retailing and parimutuel betting applications discussed above. Another advantage of the device is that all information is preset and may be completely checked, and altered if desired or necessary, before the card is punched. Additionally, inasmuch as the punch pins are preset for operation, selected ones representative of repetitive information to be recorded on a large number of cards may remain in operative or inoperative positions for many punching cycles, thereby eliminating the need for any resetting by the operator. The punching device may be manufactured at relatively low cost, and is practically maintenance free, being of durable and simple construction.

For a better understanding of the invent-ion, reference may be made to the following detailed description of an exemplary embodiment of a punching device, taken in conjunction with the figures of the accompanying drawings, in which:

FIGURE 1 is a plan view of a punching device, in accordance with the invention;

FIG. 2 is a side view in section of the device of FIG. 1 taken generally along the line 22 of FIG. 1;

FIG. 3 is an end view in section of the device of FIG. 1 taken generally along a plane defined by the line 33 of FIG. 2;

FIG. 4 is a schematic diagram of a control system for the punching device; and

FIGS. 5-8 illustrate four exemplary devices for setting the punch pins.

Referring to FIGS. 1 to 3, the punching device includes a frame having a pair of end plates and 12, and a base plate 14. Attached below the base plate 14 and spaced therefrom is a die-mounting member 16 having a punch die 18 installed thereon.

A punch pin carrier 22 is mounted for up and down movement on posts 20 and 20' which project up from the base plate 14. A plurality of holes are formed in the carrier 22 for receiving a like plurality of punch pins arranged in rows indicated by the numerals 24, 25, 26, 27, 28 and 29. As shown in FIG. 1, the rows extend lengthwise of the pin carrier 22, with the pins in each row being of the same length, as seen best in FIG. 2. The punch pins are also aligned in columns, designated a through 1, respectively, transverse to the carrier 22, the pins in each of thecolumns varying in length in step fashion as seen in FIG. 3. A card cancelling punch 33 having an annular cutting 'edge is also bolted or otherwise rigidly supported in the carrier 22.

The punch pins 24 to 29 have enlarged head portions at their uppermost ends which are loosely retained in correspondingly countersunk portions of the holes in the carrier 22 to enable the pins to be withdrawn from the die 18 when the carrier moves to its upper position. The pins themselves are received loosely in the holes of the carrier 22 but are accurately positioned in bushings 32 in the base plate 14, to precisely locate the perforation to be made in the card, and aligned with suitable holes in the die 18. The chad punched from the card falls through holes provided in the die carrier 16 and is collected in an appropriate receptacle (not shown).

A chamber 34 for receiving a card 36 and orienting it in a predetermined position is formed in the base plate 14 above the die 18. The chamber 34 may be provided with a cornerto match the chamfered portion 37 of the card 36 (FIG. 1). Projecting from the outer face of the end plate 10 and having an upper surface contiguous with the bottom of the chamber 34 is a card positioning member or tray 40 having an upwardly directed flange 42 and a thumb slot 44. When the card 36 is properly inserted into the chamber 34, it drops into position adjacent the flange 42. If not properly oriented, the diagonal corner of the chamber 34 prevents the card from being fully inserted and it will project out above the flange 42. The failure of the card 36 to be fully received on the positioning member 40 will alert the user that the card is not properly oriented. Additionally, as will be described in more detail hereinafter, the punching device will not operate unless the card 36 is properly inserted into the chamber 34.

Positioned in the carrier 22 for selectively blocking the upward movement of the punch pins 24 to 29 are interposer bars 46, 47, 48, 49, and 51 having actuating means coupled thereto. The actuating means, as shown in FIG. 3, may consist of flexible couplings 53, such as Bowden wire type connectors having control wires 53' which are connected to the interposer bars 46 to 51 and casings 53". Springs 54 pre-loaded in compression are positioned between the ends of the interposer bars and a plate 55 mounted on the carrier. Upon release of the wires 53 the springs 54 urge the bars into the punch pin holes to block outward movement of the punch pins. Retr-action of the control wires 53 withdraws the interposer bars from their blocking positions in the punch pin holes.

The interposer bars 46 to 51 for each of the punch pin columns a to l are aligned in respective vertical planes, as shown in FIG. 3, and are of successively greater lengths for the respective rows of punch pins. The punch pins 24 to 29 in each column are of correspondingly greater lengths, whereby each interposer bar cooperates with an associated punch pin. In this manner, a large number of punch pins are readily accommodated in a relatively small space. For ease of illustration, interposer bars associated with the punch pins columns a, c, e, g, i and k only are shown in FIG. 1, it being understood that all of the columns a to I will have associated therewith a plurality of interposer bars equal in number to the number of pucnh pins therein, as shown in FIG. 3.

The actuating mechanism of the Earrier 22 is best shown in FIGS. 2 and 3. Journaled in bearings 56 and 58 installed, respectively, in the side members 10 and 12 is a shaft 60 which is driven by a motor 62 through a belt and pulley system 64. The pin carrier 22 is coupled to the shaft 60 for vertical reciprocal movement by an eccentric circular cam 68 secured by a Woodruff key 70 on the shaft 60 and a connecting link 72 having a pin 74 thereon which is received by a bracket 76 installed on the carrier.

The operation of the punching device is controlled by the circuit of FIG. 4. A switch is mounted, as shown in FIG. 2, below the die carrier 16 and has an actuating arm 101 arranged for operative engagement by the card 36. One side of the switch 100 is connected by leads 102 and 104 to a power source 106, and the other side connected by lead 107 to one side of a push-button actuated switch 108. A lead 109 connects the other side of switch 108 to one terminal of a third switch 110. As best illustrated in FIG. 2, the switch 110, which is mounted on a bracket 116 fastened on the top of the side plate 12, includes a cam follower 110 which engages a cam 112 carried on the shaft 60. The switch 110 is closed during the major portion of travel of the cam 112 but is opened when the follower drops into detent 112' which subtends about 10 degrees of the circumference of the cam. The cam 112 also operates, by means of follower 114, a switch 114 similarly mounted on the bracket 116. One terminal of switch 114 is connected, in a lead 104, to one side of the power source 106, and the other terminal coupled through the coil of relay to the other side of source 106. The other terminal of switch 114 is also connected to the other side of switch 110. When energized, the coil of relay 120 closes its armature to complete an actuating circuit for the motor 62 from the power source 124 and over conductors 126, 128.

Several types of mechanisms for actuating the couplings 53 which control the interposer pins 46 to 51 are shown in FIGS. 5 to 8. FIG. 5 illustrates a manually actuated push button arrangement 200. A bar 202 (the outer end of which is provided with a push button 205) is slidably mounted in a frame member 204. The wire 53' of the flexible coupling 53 is fastened to the other end of the bar 202, and the outer casing 53" is afiixed to a bracket 206. The bar 202 includes a notch 208 adapted to engage spring loaded latching bar 210, and pins 211 and 212. A restoring spring 214 and restoring bars 216 and 218 are provided for returning the actuating bar 202 when the latching bar 210 is removed from engagement in the notch 208 and pulling back the wire 53 and withdrawing the interposer bar from the punch pin hole.

A number of the lockable push-buttons 200 may be arranged to cooperate with the latching bar 210. When any one of them is pushed, the latching bar is urged downward along a tab 220 projecting from the notch 208, thereby releasing the previously actuated button 200 and withdrawing the corresponding interposer bar, as described previously.

The control device of FIG. 6 includes a flanged member 222 having two spaced-apart rows of holes 224 in the base portion and the Bowden wire couplings 53 installed in the upstanding leg 223. The actuating wires 53' are connected to pins 228 which fit firmly in the holes 224. The associated interposer bars are selectively positioned in either blocking or non-blocking positions by moving the pins 228 between the two rows of holes 224.

Referring to FIG. 7, the Bowden wire coupling 53 is coupled to the armature of a solenoid 232 installed in a channel member 234. The solenoid 232 is connected to a power supply 236 by lead 238 and by lead 240, which has a switch 242 connected therein, and is biased open by a spring 244 which urges the actuating wire 246 outwardly when the solenoid 232 is de-energized. When the solenoid 232 is energized, by closing the switch 242 to complete a circuit to the power source 236, the control wire 53 is withdrawn, thereby moving the associated interposer pin out of its blocking position.

In the actuating device shown in FIG. 8, the Bowden wire coupling 53 is connected to a spring loaded pin 248 mounted in a frame member 250. The pin 248 is actuated by a rotating cam 252 of a binary word generator (not shown) to selectively place the associated interposer pin into either blocking or non-blocking position.

The punching device operates in the following manner. First, the interposer bars 46 to 51 for those punch pins 24 to 29 which will perforate the information into the card are placed into blocking position in the holes above the pins at the instance of the actuating mechanisms. The particular actuating mechanism operating specific interposer bars will vary according to the use of the device. One group of punch pins may perforate holes in the card representative of information which is preset and changed only infrequently, rather than set by the individual customer or bettor. In such cases, the corresponding interposer bars may be actuated by the devices of FIGS. 6 or 7. The punches to be selected by the customer or bettor may be rendered operable by the manual push buttons of FIG. 5, which will be located to be accessible from the exterior of the housing in which the punching device is mounted. In any event, all of the punch pins are preset and may be checked and altered before punching the card.

When the desired pattern to be punched has been set by blocking the proper punch pins, a card 36 is inserted into the chamber 34, or the card may be inserted prior to making the selection. As previously mentioned, the card must be oriented properly before the device will operate to punch it. More particularly, if the diagonal corner 37 is not in the correct position, the card cannot fully enter the chamber and will not drop behind the flange 42 of the positioning member 40 or close the switch 100. A correctly inserted card moves the arm 101 of switch 100 to close it. When the push-button switch 108 is pressed by the user, a circuit is completed from the power source 106, through leads 102 and 107, switch 108, lead 109 and switch 110, whose contacts at the time of inserting the card are closed as shown in FIG. 4 by the cam 112, lead 118, and the coil of relay 120. Relay 120 is thus energized to complete a circuit from power source 124 to the motor 62 through its armature 125.

The motor then rotates the shaft 60 and eccentric cam 68, driving the punch pin carrier 22 downwardly toward the card. The blocked punch pins 24 to 29 and the cancelling punch 33 contact and perforate the card, as shown in FIGS. 2 and 3. The unblocked punch pins, for example, pin 28d of FIG. 2 and pin 25f of FIG. 3, are lifted and supported by the card and do not perforate it.

Cam 112 is likewise driven by motor 62 and after approximately 5 to degrees or rotation, lifts cam follower 114, thus maintaining both the switches 110 and 114 closed. A second circuit from the power source 106 is now completed to the coil of relay 120, through lead 104, switch 114 and lead 118. It Will be understood that the switch 108 is of a suitable type which will remain closed until the second circuit has been completed, and switch 108 may now, therefore, open. Also, at the time the other perforations are being made, the portion of the card 36 contacting switch 100 is removed by punch member 78 and the severed portion falls through the corresponding opening in the die carrier 16, thereby permitting the arm 101 to move forward opening switch 100. Thus the first power circuit, through lead 102, switch 100, lead 107, switch 108, lead 109, switch 110 and lead 118, to the relay 6 120 is broken, but the relay 120 remains energized by the second power circuit to permit operation of the motor to continue.

As the shaft 60 continues to rotate the punch pin carrier 22 is returned to its uppermost position. The heads of punch pins 24 to 29 reseat on the narrower portions of the holes and are withdrawn into the base plate 14. It should be noted that the switch contacting portion of the card 36 has been removed, and the card is rendered incapable of being repunched in an intelligible manner, inasmuch as the switch cannot thereafter be closed with the card if properly inserted,

When the cam 112 has rotated through about 335 1 follower 114' of switch 114 drops into the detent 112 thereby opening the switch and breaking the circuit through lead 104, 102, switch 114 and lead 118, to the relay 120. The relay 120 is de-energized breaking the circuit to the motor 62. The motor stops after a small additional travel of the cam 112 and shaft 60 during the breaking period of the drive system. The punched card may now be removed.

The separation between the switch cam followers and 114' and the angular width of and orientation of the detent 112' is designed to allow for the inertia of the braking and transition torques inherent in the motor 62 and belt drive 64. When the rotation of shaft 60 stops, the cam 112 is thus positioned so that the follower 110' of switch 110 rests on the outer circumference and the switch 110 is closed.

The control circuit is now in readiness for the closing of switch 100 by insertion of the next card, and the pin carrier 22 and punches :24 to 29 are in their uppermost position. The interposer bars 46 to 51 can now be reset to block selected ones of the pins 24 to 29 for punching information onto the next card.

It will be understood by those skilled in the art that the above-described embodiment of the invention is meant to be merely exemplary and it susceptible of considerable variation and modification without departing from the spirit and scope of the invention. Accordingly, the invention is not deemed to be limited except as defined in the appended claims.

I claim:

1. In a punching device for simultaneously perforating a web at a plurality of predetermined locations having a punch pin carrier, a die member mounted below said carrier, means defining a chamber between said carrier and said die member and means for moving said carrier toward and away from said die member, the combination therewith of a plurality of punch pins slidably mounted for axial movement in said carrier, means for limiting the downward movement of said punch pins relative to said carrier so that they project into said die member when the carrier is in its lowermost position and do not project into said chamber when said carrier is in its uppermost position, said pins being arranged generally in at least two rows and at least two columns, interposer bars slidably mounted in said carrier at an angle to said pins and operable to block the upward movement of said pin, means for actuating said interposer bars between blocking and non-blocking positions, said interposer bars for each column of pins arranged in tiers so that the lowermost of said bars operates the pins in the first row and each adjacent bar moving successively upward in the tier operates each successive pin in the column, and the successive pins in each column being longer than the preceding pins, said means for actuating the interposer bars including for each of said bars a flexible cable having a longitudinally movable element extending the length thereof, one end of said element being connected to said interposer bar, and means for moving said element coupled to the other end thereof, said moving means including a cam follower coupled to the other end of said element and a rotating cam for actuating said cam follower.

2. A punching device for perforating a web at predetermined locations comprising a punch pin carrier, a die member positioned adjacent said punch pin carrier, means defining a chamber between said carrier and said die member for receiving a member to be punched in a predetermined position therein, means for selectively reciprocating said carrier toward and away from said chamber through one cycle, a plurality of punch pins slidably mounted for axial movement in said carrier, means for limiting the downward movement of said punch pins relative to said carrier so that they project into said die member when the carrier is in its lowermost position and do not project into said chamber when the said carrier is in its uppermost position, said pins being arranged generally in at least two rows and at least two columns, an interposer bar for each of said punch pins slidably mounted in said carrier at an angle to said pins and operable to block the upward movement thereof, said interposer bars for each column of pins being arranged in tiers so that the lowermost of said bars operate the pins in the first row and each adjacent bar moving successively upwardly in the tier operates each successive pin in the column, and the successive pins in each column being longer than the preceding pins, and means for actuating said interposer bars, said actuating means including for each of said bars a flexible cable having a longitudinally movable element extending the length thereof, one end of said element being connected to said interposer bar and means for moving said element coupled to the other end there-of, said moving means including manually actuated push-button means coupled to a first selected group of said elements, means couple-d to a second predetermined group of said elements for detachably securing said other end in a position holding the interposer bar associated therewith in a blocking position or in a non blocking position, and means including a cam follower coupled to each of a third selected group of said elements and a rotating cam positioned in operative engagement with said cam follower for actuating said cam follower. I

Mp3,L -In a punching device for simultaneously perforating 5 55 at a plurality of predetermined locations having a punch pin carrier, a die member mounted below said carrier, means defining a chamber between said carrier and said die member and means for moving said carrier said carrier so that they project into said die member when the carrier is in its lowermost position and do not project into said chamber when said carrier is in its uppermost position, said pins being arranged generally in at least two rows and at least tWo columns, an interposer bar for each of said punch pins slidably mounted in said carrier at an angle to said pins and operable to block the upward movement of said pins, means for selectively ac tuating said interposer bars between blocking and nonblocking positions, said interposer bars for each column of pins arranged in tiers so that lowermost of said bars operates the pins in the first row and each adjacent bar moving successively upward in the tier operates each successive pin in the column, and the successive pins in each column being longer than the preceding pins, a shaft rotatably mounted adjacent said punch pin carrier, electric motor means for rotating said shaft, crank means coupling said shaft to said carrier for imparting reciprocating movement to said carrier toward and away from said die member, a cam fixed on the shaft, said cam having an annular surface extending about the major portion thereof and constituting a running portion, and a second surface space-d from the annular surface constituting a start-stop portion, a power source, a starting circuit coupling said source to said mot-or for initially energizing said motor including first switch means operable by said cam, and sustaining circuit means coupling said source to said motor for sustaining the energizati-on of said motor after a predetermined rotational movement of said shaft and including second switch means operable by said cam, said first and second switch means being positioned in relation to the cam start-stop surface such that said first switch is closed when said second switch is open.

4. The apparatus as claimed in claim 3 further comprising a third switch means in said starting circuit posit ioned .to be closed upon the positioning of the member to be punched in proper position in said chamber, and a card canceling punch member so positioned in said carrier as to remove the portion of the member to be punched upon a punching operation thereof.

References Cited by the Examiner UNITED STATES PATENTS 2,044,707 6/ 1936 Lasker 234 X 2,397,112 3/1946 Hueber 234ll6 X 2,521,118 9/1950 Gollwitzer et al 234 116 2,781,846 2/1957 Madden et al. 234'38 X 2,791,275 5/1957 H-ooe 23430 X 2,965,169 12/1960 Berghell 2341 14 X 2,967,569 l/196l Eden 2341 14 3,018,036 1/1962 Snowdon et al 234--1 11 3,018,947 1/1962 Harruff et al 234-30 WILLIAM S. LAWSON, Primary Examiner. 

1. IN A PUNCHING DEVICE FOR SIMULTANEOUSLY PERFORATING A WEB AT A PLURALITY OF PREDETERMINED LOCATIONS HAVING A PUNCH PIN CARRIER, A DIE MEMBER MOUNTED BELOW SAID CARRIER, MEANS DEFINING A CHAMBER BETWEEN SAID CARRIER AND SAID DIE MEMBER AND MEANS FOR MOVING SAID CARRIER SAID ELEMENT BEING CONNECTED TO SAID INTERPOSER BAR, AND TOWARD AND AWAY FROM SAID DIE MEMBER, THE COMBINATION THEREWITH OF A PLURALITY OF PUNCH PINS SLIDABLY MOUNTED FOR AXIAL MOVEMENT IN SAID CARRIER, MEANS FOR LIMITING THE DOWNWARD MOVEMENT OF SAID PUNCH PINS RELATIVE TO SAID CARRIER SO THAT THEY PROJECT INTO SAID DIE MEMBER WHEN THE CARRIER IS IN ITS LOWERMOST POSITION AND DO NOT PROJECT INTO SAID CHAMBER WHEN SAID CARRIER IS IN ITS UPPERMOST POSITION, SAID PINS BEING ARRANGED GENERALLY IN AT LEAST TWO ROWS AND AT LEAST TWO COLUMNS, INTERPOSER BARS SLIDABLY MOUNTED IN SAID CARRIER AT AN ANGLE TO SAID PINS AND OPERABLE TO BLOCK THE UPWARD MOVEMENT OF SAID PIN, MEANS FOR ACTUATING SAID INTERPOSER BARS BETWEEN BLOCKING AND NON-BLOCKING POSITIONS, SAID INTERPOSER BARS FOR EACH COLUMN OF PINS ARRANGED IN TIERS SO THAT THE LOWERMOST OF SAID BARS OPERATES THE PINS IN THE FIRST ROW AND EACH ADJACNET BAR MOVING SUCCESSIVELY UPWARD IN THE TIER OPERATES EACH SUCCESSIVE PIN IN THE COLUMN, AND THE SUCCESSIVE PINS IN EACH COLUMN BEING LONGER THAN THE PRECEDING PINS, SAID MEANS FOR ACTUATING THE INTERPOSER BARS INCLUDING FOR EACH OF SAID BARS A FLEXIBLE CABLE HAVING A LONGITUDINALLY MOVABLE ELEMENT EXTENDING THE LENGTH THEREOF, ONE END OF MEANS FOR MOVING SAID ELEMENT COUPLED TO THE OTHER END THEREOF, SAID MOVING MEANS INCLUDING A CAM FOLLOWER COUPLED TO OTHER END OF SAID ELEMENT AND A ROTATING CAM FOR ACTUATING SAID CAM FOLLOWER. 